This is the timeline of the known events and history of the games of the Splatoon series until now.
The End of the Human Era
Around 12,000 years ago - Humans live as the dominant species of Earth, with their history being implied to largely mirror that of real life humanity, apart from reaching a further point of technological advancement than has been reached in reality.
Around 12,000 years ago - While academic circles warn of significantly rising sea levels, no policy is enacted to deal with the situation.[1] Meanwhile, the world becomes embroiled in warfare.[2]
Around 12,000 years ago - The professor creates a cryogenic capsule that could freeze a living creature for thousands of years, and uses it to preserve his pet cat, Judd,[3] who was also injected with a medicine that made him immortal.[4][5] The capsule also contains a single cell of Judd's DNA, making it capable of creating a clone of him.